Ping Federate - Unusual mail domain

let known_domains = 
PingFederateEvent
| where TimeGenerated between (ago(14d) .. (1d))
| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
| extend m_domain = extract(@'@(.*)', 1, email)
| where isnotempty(m_domain)
| summarize makeset(m_domain);
PingFederateEvent
| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
| extend m_domain = extract(@'@(.*)', 1, email)
| where isnotempty(m_domain)
| where m_domain !in (known_domains)
| extend AccountCustomEntity = DstUserName
| extend IpCustomEntity = SrcIpAddr

name: Ping Federate - Unusual mail domain.
query: |
  let known_domains = 
  PingFederateEvent
  | where TimeGenerated between (ago(14d) .. (1d))
  | extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
  | extend m_domain = extract(@'@(.*)', 1, email)
  | where isnotempty(m_domain)
  | summarize makeset(m_domain);
  PingFederateEvent
  | extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
  | extend m_domain = extract(@'@(.*)', 1, email)
  | where isnotempty(m_domain)
  | where m_domain !in (known_domains)
  | extend AccountCustomEntity = DstUserName
  | extend IpCustomEntity = SrcIpAddr  
description: |
    'Detects unusual mail domain in authentication requests.'
tactics:
- InitialAccess
requiredDataConnectors:
- dataTypes:
  - PingFederateEvent
  connectorId: PingFederate
- dataTypes:
  - PingFederateEvent
  connectorId: PingFederateAma
queryPeriod: 14d
queryFrequency: 1h
status: Available
triggerThreshold: 0
id: dc79de7d-2590-4852-95fb-f8e02b34f4da
triggerOperator: gt
version: 1.0.1
relevantTechniques:
- T1078
severity: Medium
kind: Scheduled
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IpCustomEntity
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PingFederate/Analytic Rules/PingFederateUnusualMailDomain.yaml

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/dc79de7d-2590-4852-95fb-f8e02b34f4da')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/dc79de7d-2590-4852-95fb-f8e02b34f4da')]",
      "properties": {
        "alertRuleTemplateName": "dc79de7d-2590-4852-95fb-f8e02b34f4da",
        "customDetails": null,
        "description": "'Detects unusual mail domain in authentication requests.'\n",
        "displayName": "Ping Federate - Unusual mail domain.",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IpCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PingFederate/Analytic Rules/PingFederateUnusualMailDomain.yaml",
        "query": "let known_domains = \nPingFederateEvent\n| where TimeGenerated between (ago(14d) .. (1d))\n| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)\n| extend m_domain = extract(@'@(.*)', 1, email)\n| where isnotempty(m_domain)\n| summarize makeset(m_domain);\nPingFederateEvent\n| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)\n| extend m_domain = extract(@'@(.*)', 1, email)\n| where isnotempty(m_domain)\n| where m_domain !in (known_domains)\n| extend AccountCustomEntity = DstUserName\n| extend IpCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}